#include<stdlib.h>
#include<stdio.h>
#include<unistd.h>
#include<pthread.h>
typedef struct ct_sum
{	int sum;
	pthread_mutex_t lock;
}ct_sum;
void * add1(void * cnt)
{     
   
   	pthread_mutex_lock(&(((ct_sum*)cnt)->lock));
   	int i;
       	for( i=0;i<50;i++){
       		(*(ct_sum*)cnt).sum+=i;}

	printf("sum %d\n",((ct_sum *)cnt)->sum);
   	pthread_mutex_unlock(&(((ct_sum*)cnt)->lock));
  	pthread_exit(NULL);
  	return 0;
}
void * add2(void *cnt)
{     
   	int i;
   	cnt= (ct_sum*)cnt;
   	pthread_mutex_lock(&(((ct_sum*)cnt)->lock));
   	for( i=50;i<101;i++)
   	{    (*(ct_sum*)cnt).sum+=i;       
   	}
	printf("sum %d\n",((ct_sum *)cnt)->sum);
  	pthread_mutex_unlock(&(((ct_sum*)cnt)->lock));
   	pthread_exit(NULL);
   	return 0;
}
int main(void)
{ 	int i;
	pthread_t ptid1,ptid2;
	int sum=0;
	ct_sum cnt;
	pthread_mutex_init(&(cnt.lock),NULL);
	cnt.sum=0;
	pthread_create(&ptid1,NULL,add1,&cnt);
	pthread_create(&ptid2,NULL,add2,&cnt);

	pthread_mutex_lock(&(cnt.lock));
	printf("sum %d\n",cnt.sum);
	pthread_mutex_unlock(&(cnt.lock));
	pthread_join(ptid1,NULL);
	pthread_join(ptid2,NULL);
	pthread_mutex_destroy(&(cnt.lock));
	return 0;
} 
 


